Quote:
Originally Posted by Taylor95
I've heard that it needs to be changed at least every 7 years. Coolant can become very acidic (perhaps from the breakdown of hydrocarbons) and corrode your engine.
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When I got my 1990 Mercury in August 2014, it had coolant as brown as mud and I changed the coolant about 5 - 6 weeks later; now the coolant has brown flakes floating around.